.net Timer With Windows 7 Dual Processors?
Apr 14, 2010
I have been writing visual basic and vb .net applications for years and have come across this problem with the timer component under Windows 7 32bit on dual core Intel processors. This problem only occurs with Windows 7 running on a dual core processor, single core and under the virtual pc on any processor works.
I have attached a test program to show this problem. The program uses 2 timers to count down to 0. It does not matter what type of timer component I use system.timer.timer or system.windows.forms.timer. I read the system.timer.timer may fix this problem so I changed the program to use it but it did the exact same thing. Left it in anyway.
The program: Timer1 is set to a number of ms for a given amount of time say 150000 for 150 seconds and started. The timer will expire correctly. At the same time a second timer Timer2 is set to 1000 ms for a count down display to 0. Timer2 fires and the count is updated. This happens and everything looks fine. When Timer1 fires I disable timer2 so it will stop counting down. Timer2's countdown is at 2 instead of 0. It is firing slow. If I increase the value of timer1 to say 500 seconds timer2 is behind by 6 seconds. These amounts are the same for the 2 very different computers I ran this on but both are dual processor systems running Windows 7. The exact code works correctly on Windows Xp on the same processors and works under Windows 7 on a Pentium 4 system.
[Code]...
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Aug 27, 2010
After I upgraded from Windows Xp to Windows 7 on any dual core cpu machine my programs that use a simple timer function run incorrectly. The program works with the exact same hardware under Windows Xp and Windows Server 2003. I am using Visual Studio 2005 to write .NET Visual Basic programs that use 2 timers to count down. The first timer, timer1, is set to a value say 150000 ms (150 seconds). The second timer, timer2, is set to 1000ms (1 second). Both timers are enabled one right after the other from a button click event and begin. The timer2 routine running every second updates a label counting down the seconds. When timer1 fires it disables itself and exits. Timer2 also checks to see if timer1 is still running if it is not it will stop. Under Windows Xp and Windows Server 2003 the resulting count in the label is 0 when timer2 detects timer1 has finished. Under Windows 7 when timer1 stops timer2 is not at 0 it is 3 for 150 seconds and gets larger the more timer1 is increased. It appears to me timer2 is not being fired every 1000ms as it was under Windows Xp.
I have included the Visual Basic code below. If you want to test it just run Visual Studio and create a new project. Put the buttons, numericupdown, and labels in your form and past my code into the correct buttons. I have used these type of timer events for years without any problems unit Windows 7. Windows 7 on a single core Pentium 4 with hyperthreading turned on works fine. Windows 7 on a dual core E6500 fails, Windows Server 2003 works.
Public Class Form1
Dim I As Integer
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[CODE]...
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Aug 25, 2010
I try to create a dual video player with VB 2010.
With that I have 2 forms, 1 main form (with all the controls and it should contain a preview screen of what is being displayed on the second form.
And a second form (with a windows media player component).
Now the main form should have (as told) a preview screen of what is shown on the second screen, I want to know if it is possible to have is as the windows 7 taskbar thumbnail (when preview the mediaplayer).
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Aug 18, 2011
Is there code or a way to distinguish Hyperthreaded processors from non-hyperthreaded processors? I know how to detect hyperthreading in general But this is whether or not a logical processor has it but not specific processors.
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Jan 15, 2009
I need an accurate timer to interface a Windows application to a piece of lab equipment.I used System.Timers.Timer() to create a timer that ticks every 10 msec, but this clock runs slow. For example 1000 ticks with an interval of 10 msec should take 10 wall-clock seconds, but it actually takes more like 20 wall-clock sec (on my PC). I am guessing this is because System.Timers.Timer() is an interval timer that is reset every time it elapses. Since it will always take some time between when the timer elapses and when it is reset (to another 10msec) the clock will run slow. This probably fine if the interval is large (seconds or minutes) but unacceptable for very short intervals.Is there a function on Windows that will trigger a procedure every time the system clock crosses a 10 msec (or whatever) boundary?
UPDATE: System.Timers.Timer() is extremely inaccurate for small intervals.I wrote a simple program that counted 10 seconds several ways:
Interval=1, Count=10000, Run time = 160 sec, msec per interval=16
Interval=10, Count=1000, Run time = 16 sec, msec per interval=15
Interval=100, Count=100, Run time = 11 sec, msec per interval=110
Interval=1000, Count=10, Run time = 10 sec, msec per interval=1000
It seems like System.Timers.Timer() cannot tick faster that about 15 msec, regardless of the interval setting.Note that none of these tests seemed to use any measurable CPU time, so the limit is not the CPU, just a .net limitation (bug?)For now I think I can live with an inaccurate timer that triggers a routine every 15 msec or so and the routine gets an accurate system time. Kinda strange, but...I also found a shareware product ZylTimer.NET that claims to be a much more accurate .net timer (resolution of 1-2 msec). This may be what I need. If there is one product there are likely others.
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Feb 24, 2011
In a vb 2010 project, I have 2 win forms: Form1 and Form2.
In the Form1 class there is a server-based timer: when the "elapsed event" fires, then I update the text of a Label1 on the Form2. A very simple code:
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Jun 15, 2009
I'm wondering what exactly is the difference System.Timers.Timer and System.Windows.Forms.Timer???
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May 27, 2010
What i have heard is, that a program dont get much faster on a dual core (or quad core) than on a single core processor, because windows assigns the program to just one core. (but still a little faster because other programs run on the other cores instead or something like that).And if you want to exploit the power of multicores, you have to code in a way so that different calculations get sent to different cores simultanuasly and then gather the result afterward.First of, is this correct? And if so (or if not so) is it possible to program in vb to exploit multicores. I mean can you create 4 threads and assign them to each core, or does this require some heavy C++ coding?The reason im asking is because and application i have created uses biometric identification (fingerprints) and this requires somcalculations, the more fingerprints that gets stored. Then if i somehow could make it use more codes, maybe this will be a little faster?Is this possible in vb, or would i get way in over my head for trying to work with th
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Jul 29, 2009
I want to control all the processes of my system. for instance, whenever i start a new process, my application has to ask me whether to allow it or not. I should have control to either pause, resume or terminate the process. for eg,if i start IE, my application should ask whether to allow the process or terminate it. if i provide "allow", the process should run, either it should terminate. Can i use "process" control to do these stuffs? Or do i need any API?
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Feb 9, 2011
I want to use VB2010 make a timer to shutdown window.The shutdown command is [code]It worked properly if I am using Windows. But when I leaved for a while and Windows goes to the "screen saver". My program cannot shutdown the window. It seem the screen saver has more priority than my program.
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Mar 6, 2012
I have a timer running like a scoreboard countdown timer. Is there a way that I can display that same timer into two windows forms (winforms) without resorting to properties?
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Feb 27, 2008
The Timer canot work at Windows services, Anyone face b4 ?? Any extra setting need to set b4 use it ??
in VS2003 windows services can work.
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Dec 6, 2011
Right now I have a windows service which only task is to gather data from a database with a specific DSN and then send out an email if the data is valid. The service contains a timer which ticks every 5 minuts and performs the tasks above.Now I need to re-write the windows service to be able to run on more than 1 DSN.I was thinking of making several threads inside the windows service and then again have a seperat timer inside each thread.Is this a good idea and how can this be done? I want to avoid having a windows service for each DSN.[code]
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Jun 30, 2011
Whatever project I'm making, I always encounter a problem with a Windows Forms Timer control, I guess I just make a little mistake somewhere... So I thought I'd post it here and hopefully someone here can explain what I'm doing wrong.
[Code]....
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Jun 16, 2011
In my Windows Form's application, I enable and start a Windows Form's Timer for a state machine which interacts with various User Controls. In one part of the state machine where an external device is being rebooted, I need to disable the User Interface (a User Control's UI) for the time it takes the device to reboot. The problem exists in that once I use System.Threading.Sleep, the timer that fires the State Machine stops and never restarts. I even re-enabled the Timer and re-started it after the Sleep command but to no avail. Is this expected operation or should a Windows Form's Timer be able to restart after a Sleep?
Snippet of code from a step in the state machine below:
Cursor.Current = Cursors.WaitCursor
MainForm.Enabled = False
System.Threading.Thread.Sleep(8000)
MainForm.Enabled = True
Cursor.Current = Cursors.Default
MainForm.t1.Enabled = True
MainForm.t1.Start()
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Jan 19, 2010
I have a windows service application that runs a timer. When this timer ticks it starts another application that runs a process.The application is started but it does nothing. On the other hand if i run the application manually it works fine.
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Jul 1, 2011
I have a VB.NET desktop application that I'm using to monitor events in another windows application running on my system.I need to respond to certain events in a matter of seconds.One of the events I'm monitoring instantly changes the window title of a child window within the main process (I'm not changing it, the application I'm monitoring causes the change in it's own child window title).I have a function that uses windows API's to iterate through the title text of all the process's child windows, and I'm checking for certain values in the titles.Is it a bad idea to be running this timer/title check once every second? Are there performance issues associated with running a timer in windows every second 24/7? Is it also bad for performance to be calling the API's which retrieve the titles of all the application's child windows? Could I eventually cause that application to crash by sending requests to it so often?
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Jan 11, 2010
Hello,
I'm writing a windows service and initially tried just using a regular System.Windows.Forms.Timer, but never saw it's tick event get fired in my debugger. From doing some research, it appeared that I needed to use the S ystem.Timers.Timer control instead. In order to make debugging easy, I set my timer interval to a really short value 1000 ms. I'm seeing some rather strange behavior, though. It appears that my timer control is creating multiple threads within my application, or is this just a bug in my debugger? I have an event handler for the Elapsed event like so:
[code]...
When I step through my code like this, it now appears to work as expected. Has anyone else run into this?
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Aug 10, 2010
If a form is being displayed on the secondary monitor, is there a way to make sure that a MessageBox generated by that form will display back on the primary monitor? The form is being displayed over a projection system and some messages do not need to be seen by the audience, just the computer operator.
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Jan 27, 2012
What i want to happen is for the dictionary keys and items to be overwritten each time it is executed, as the data needs to be up to date.
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Feb 4, 2012
I have a System.Windows.Forms.Timer named "DialogBoxTimer" set up on a form. When the form loads, it has a command to stop the timer. I have a routine [SPDataRecd(...)] that handles SerialPort1.DataReceived from a serial port (modem). When it is activated by a modem event, I want it to start the timer [DialogBoxTimer.Start()], but it doesn't work.If the timer is running, SPDataRecd can *stop* the timer [DialogBoxTimer.Stop()], but it can't start a stopped timer.
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Oct 27, 2011
I just got this really cool 9" monitor (USB attached) which I will be using for dialogs in my vb application. Can someone tell me why this code displays on both machines? if I change screen=AllScreens(1) to (2) the form is only shown on the primary but I want to show it on the very cool USB screen.
[Code]....
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Jul 19, 2010
My app displays a list of records in a DataGridView on the main form. I've developed code for cut/copy/paste for the selected records and have put the code behind Cut/Copy/Paste menu items under a classic 'Edit' menu design, with the standard shortcut keys(Ctrl + X, Ctrl + C, Ctrl + V).
The trouble is, I also want the shortcut keys to work on selected text when I'm editing inside text fields on a record in the DataGridView. So I need the shortcut behaviour to change depending on whether I'm editing a record or selecting record(s).
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Feb 8, 2012
I have a form1 and many other sub forms in my software.I want all those forms to work on a 2nd monitor (if the user does have a 2nd monitor)while working on my 1st monitor as well.But i don't have 2 monitors in my system hence i cant test this feature out.But dual monitor integration is a very important part of my software.
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Sep 15, 2009
The command works but im getting an incorect time It returns 15/9/2009 12:00:00 the date is fine (was ok when this thread was written)but the time is always the same 12:00:00 Is something wrong with the server or am i entering not the right command?
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Nov 11, 2010
Is there a simple way to differentiate single display vs. dual display clone? I am asking about dual clone, not extended desktop. .Net Screen class treats dual clone as single display. I could not find useful WMI method also.
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Jun 16, 2009
Is this possible in VB 2005? Mirroring or extending over a second display?
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Jul 8, 2009
I am working on a custom bulletin board system for my company. The idea is to have a program running that displays a full screen bulletin board on many monitors around our facility. I wrote a VB client that pulls from a server and displays a single board perfectly - I am wondering how to expand this.
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Oct 30, 2009
I need a 2-listbox mover/selection type control such as the example here: [URL] For over a week now I've searched countless forums and done myriads of googles. All I've been able to find is C++ or ASP based stuff. I really would like this to be VB.net, but at this point, I'd even settle for C#.
I've taken a shot at developing it myself, but am too new to the .Net world to really get anywhere with it other than being completely overwhelmed and frustrated. I've even looked at some 3rd party custom control webistes, and am even willing to spend a few bucks for this thing, if I could find one that suits my needs.
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Sep 28, 2009
I've got a dual monitor setup, my main monitor is a Dell 20" 1680x1050 res, secondary is a Dell 17" 1280x1024.I've just updated my gfx driver (nvidia driver version 190.62).I'm using code like that shown below to get the screens and I always assumed that AllScreens(0) would be the primary screen and AllScreens(1) would be the secondary but this appears to be reversed since I updated my driver.
[code]...
Is my coding in error or is Windows reporting the screen information wrongly ? How can I be sure to set AllScreen(0) as the users primary screen and AllScreens(1) as their secondary ?
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